EP 1420242 A4 20091111 - BIOLOGICAL OPTICAL MEASURING INSTRUMENT
Title (en)
BIOLOGICAL OPTICAL MEASURING INSTRUMENT
Title (de)
BIOLOGISCHES OPTISCHES MESSINSTRUMENT
Title (fr)
INSTRUMENT DE MESURE OPTIQUE BIOLOGIQUE
Publication
Application
Priority
- JP 0207350 W 20020719
- JP 2001220093 A 20010719
- JP 2002090000 A 20020327
Abstract (en)
[origin: EP1420242A1] A biomedical optical measurement apparatus comprising a light source unit for generating an inspection light containing multiple lights modulated at different frequencies, a light-receiving unit for receiving the light generated at said light source unit and passing through an object to be examined and for outputting the electric signals with the intensity corresponding to the received inspection light, and a detection means for detecting a signal with the same frequency of the reference signal in the output from said light-receiving unit. The detection means comprises an analog-digital conversion means for outputting digitized data by converting an input signal to a digital signal, a storage means for storing digitized data of multiple reference signals, a digital multiplication means for multiplying digitized data of input signals outputted from the analog-digital converting means by the digitized data of the reference signals read out from the storage means and for outputting the product of multiplication, and a digital band-limitation means for taking out DC data from the output from the digital multiplication means. Reference signal generating circuits of a number equal to that of frequencies of detected signals, which has been necessary for the conventional instrument, can be replaced by a single memory means and the configuration of the instrument can be simplified. Changes in frequency can be easily coped with by only re-writing the data of the storing means. <IMAGE>
IPC 8 full level
G01N 21/47 (2006.01); A61B 5/00 (2006.01); A61B 10/00 (2006.01); G01N 21/17 (2006.01); H03L 7/14 (2006.01)
CPC (source: EP US)
A61B 5/0059 (2013.01 - EP US); G01N 21/4795 (2013.01 - EP US)
Citation (search report)
- [Y] WO 9940841 A1 19990819 - NON INVASIVE TECHNOLOGY INC [US], et al
- [A] US 5800348 A 19980901 - KAESTLE SIEGFRIED [DE]
- [A] US 5818302 A 19981006 - OTSUKA SHIGERU [JP], et al
- [Y] BARRAGÁN L.A. ET AL: "A modular, low-cost, digital signal processor-based lock-in card for measuring optical attenuation", REVIEW OF SCIENTIFIC INSTRUMENTS, vol. 72, no. 1, January 2001 (2001-01-01), USA, pages 247 - 251, XP002548412
- See references of WO 03008944A1
Citation (examination)
PROBST PIERRE-ALAIN ET AL: "MULTIPLE-CHANNEL DIGITAL LOCK-IN AMPLIFIER WITH PPM RESOLUTION", REVIEW OF SCIENTIFIC INSTRUMENTS, AIP, MELVILLE, NY, US, vol. 65, no. 3, 1 March 1994 (1994-03-01), pages 747 - 750, XP000435201, ISSN: 0034-6748, DOI: 10.1063/1.1145096
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 1420242 A1 20040519; EP 1420242 A4 20091111; CN 1242252 C 20060215; CN 1545618 A 20041110; JP 2003098071 A 20030403; JP 4112882 B2 20080702; US 2004236195 A1 20041125; US 7460894 B2 20081202; WO 03008944 A1 20030130
DOCDB simple family (application)
EP 02749322 A 20020719; CN 02814147 A 20020719; JP 0207350 W 20020719; JP 2002090000 A 20020327; US 48400404 A 20040622